Installation tool for fasteners requiring rotary and axial movements

ABSTRACT

An installation tool for fasteners of the type wherein a nut part which is internally threaded is pulled axially to expand and/or clamp an extending sleeve part of the fastener to set it with respect to the material in which it is being used. The tool is power driven and imparts rotary motion initially to thread the nut part of the fastener into a threaded sleeve, and then to abruptly stop rotary motion and exert a strong axial pull for setting the fastener.

United States Patent Miller et al. 1 Aug. 29, 1972 [54] INSTALL ATIONTOOL FOR 2,437,191 3/1948 Gill ..72/1l4 FASTENERS REQUIRING ROTARY2,583,733 1/1952 Fischer ..72/114 AND AXIAL MOVEMENTS 2,723,777 11/1955Arntsberg ..72/ 114 {72] Inventors: Delmar Miller 918 Balboa, w2,753,072 7/1956 M tchell ..72/391 p rt Be ch Kenneth Wing Cushman, 2138Sana St" Santa 3,047,182 7/1962 Batten ..72/391 Ana, Calif. 92704Primary ExaminerCharles W. Lanham Flled: 2, 1970 Assistant Examiner-GeneP. Crosby [21] Appl. No.: 94,626 Attorney-Albert M. Herzig et a1.

Related [1.8. Application Data 57 ABSTRACT Continuation-impart of749,677, An installation tool for fasteners of the type wherein a 1963-nut part which is internally threaded is pulled axially to expand and/orclamp an extending sleeve part of U-S- h f t t t it p t t th t i l i[51] hit. Cl. ..B21d 9/05 which it is being used The tool is powerdriven and Fleld of Search l4, rotary motion to thread the nut p 56 R fCted of the fastener into a threaded sleeve, and then to 1 e erencesabruptly stop rotary motion and exert a strong axial UNITED STATESPATENTS pull for Setting the fastener. 2,423,956 7/ 1947 Amtsberg..72/391 w 12 Claims, 15 Drawing Figures 36 11 u as a 4 61 46 m 57114 {a1/ V V 60 I I 7z 7, 1M 4 412 90 A ,7 6 1: 4' [F 191 l ea 82 17594 I 102INSTALLATION TOOL FOR FASTENERS REQUIRING ROTARY AND AXIAL MOVEMENTSThis application is a continuation-in-part of application Ser. No.749,677 filed Aug. 2, 1968.

SUMMARY OF THE INVENTION The device of the invention is a toolparticularly adapted for the setting of fasteners of the type whichrequire that initially rotational movement be imparted to a mandrel andthen a strong axial pull. Fasteners of the type in question generallyembody a tubular sleevelike part and a nut part that is drawn into theend of the other part for expanding and/or splitting it and clamping thesplit leaves against the material in which the fastener is being set.The fastener may initially be integral as between the two parts with thenut part shearing from the other part when the fastener is being set.The tool initially imparts rotation to the mandrel for threading intothe nut part and then rotation is terminated and a strong axial pull isexerted to complete the setting of the fastener.

Tools of the general type referred to have been known in the prior art,but generally they have been subject to a particular deficiency. Aspointed out, initially rotation is imparted to the mandrel for threadinginto the nut part of the tool. For actual setting of the fastener astrong axial pull is necessary without rotation. The deficiencyattendant to tools of this type as previously known has been that thetool would continue to impart rotation to the fastener after thebeginning of the axial pull. This is not acceptable in the setting ofthe fasteners for various reasons. The continued rotation tends tospiral the split leaves of the fastener sleeve that are being crimpedand spoils the effectiveness and appearance of the fastener.Furthermore, this action results in the possibility of removing platingand scoring the top surface of the fastener.

In accordance with the foregoing the primary object of the invention isto provide a tool of the type described capable of producing therequired axial pull without rotation after the initial period of therotation of the mandrel.

Another object is to provide a tool of the type referred to embodying aclutch drive for the mandrel wherein relative axial movement of themandrel is provided for to produce clutching and declutching.

Another object is to provide a tool of the type. referred to embodying aclutch having toothed circular elements with biasing means to insurethat the elements will engage without the teeth points meeting andjamming.

Another object is to provide a tool of the type described havingimproved constructional arrangements to facilitate changing of mandrelsin the tool from one size to another.

Another object of the invention is to provide an assembly of the typereferred to, in a tool of this type adapted for use with tool componentsthat have different types of drives such as pneumatic or electric motordrive.

BRIEF DESCRIPTION OF THE DRAWINGS Further objects and additionaladvantages of the invention will become apparent from the followingdetailed description and annexed drawings wherein:

FIG. 1 is a view of a typical installation gun embodying theimprovements of the invention;

FIG. 2 is a cross-sectional view showing the improved construction in aposition of the parts wherein the anvil of the gun has engaged thefastener and the clutch has operated to stop rotation of the mandrel tobegin the axial pull;

FIG. 3 is a cross-sectional view similar to FIG. 2 illustrating theposition of the parts wherein the axial pull stroke has been completed;

FIG. 4 is a partial sectional view illustrating the position of theparts upon a reversal of the tool for unthreading the mandrel after thefastener has been set;

FIG. 5 is an exploded perspective view of the tool in FIGS. 2 to 4;

FIG. 6 is a sectional view taken along the lines 6-6 of FIG. 2;

FIG. 7 is a sectional view taken along the lines 77 of FIG. 2;

FIG. 8 is a detailed sectional view showing the detent which positionsthe transverse stem of the clutch mechanism;

FIG. 9 is a partial exploded perspective view of a modified fonn of theclutch arrangement;

FIG. 10 is a sectional view of the clutch arrangement of FIG. 9;

FIGS. 11, 12, and 13 are views of a modified form of the invention;

FIGS. 14 and 15 are views of a modified form of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 of the drawingsillustrates a typical form of installation gun at 10 embodying theimproved construction of the invention. The gun itself includes the part12 which is a non-rotating member embodying a spring clutch and/or agear adapter. The improvements of the invention are embodied in theassembly designated at 14. The gun embodies a generally cylindricalupper part 16; a pistol grip part 18 and a trigger 20. The gun shown isa pneumatically operated one having a flexible air connection as shownat 22 and a typical fitting as shown at 24. Other types of guns might beutilized such as electrically or hydraulically driven ones. The assembly14 is arranged to be adapted to any different type of gun, it beingunderstood that the unit 12 is also interchangeable depending on thetype of gun used. The assembly 14 is adaptable to any of thesearrangements.

Preferably, the part 12 contains a torque sensing device or clutch whichmay be of a known conventional construction, but which can be manuallyset to release at a desired degree of torque. Thus, when a fastener hasbecome set, this torque sensing device will release and power will nolonger be applied to it. This type of operation is preferably to merelystalling the drive motor when a fastener is set. A type of torquesensing device used may be a type manufactured by the Hank Thorn Companyof Norwalk, Calif. and known as the PERF-A-TORQ. This arrangement issuperior to at- As may be seen in the figures, the structure or unitindicated at 12 is coupled to the gun by way of a coupling nut and tothe assembly 14 by a similar coupling nut 32. The coupling nuts and theunit 12 have side flats adapting them to rotation by way of a wrench.The fastener to be set is shown'at 34 by way of example.

The assembly 14 comprises an adapter housing which is cylindrical, beingthreaded onto the coupling nut 32 and being threaded at the other endonto a cylindrical fitting 34 of slightly smaller diameter. The couplingnut 32 is internally threaded at one end as shown at 36 and externallythreaded at the other end as shown at 38. The fitting 34 is externallythreaded at both ends as shown at 44 and 46. The housing 40 isinternally threaded at both ends as shown.

Numeral designates a cylindrical housing threaded onto the fitting 34 asshown. The fitting 34 has an internal web 52 having a central bore 54 asshown. The housing 50 has a threaded end bore 56 which receives theanvil member 58 which has a threaded end part 60 that threads into thebore 56 and it has a cylindrical body at the end of which is the anvil62 as will be referred to more in detail presently.

Within the housing 40 is the driver unit 68 which is cylindrical beinginternally threaded at one end as shown at 70 and having a square driveextension 72 at the other end which is received within an adapterfitting 74 in the unit 12. Other forms of adapters could, of course, beutilized. Threaded into the end of the driver 68 is the drive nut 80,the end part of which bears against a thrust bearing 82. The drive nutis internally threaded as shown at 84 with a square thread and extendingthrough it is the threaded drive screw 86. Numeral 88 designates a stopnut on the drive screw, the position of which can be set by set screw90, the stop nut being positionable against the end of the drive nut 80.The drive screw 86 is on the end of a member or unit 92, the right-handpart of which is of enlarged cylindrical form as shown at 94 having abore 96. The right hand of the member or unit 92 normally bears againstthe threaded end of the anvil member 58. The end part of the unit 92 asdesignated at 97 is a slightly smaller diameter, there being a squareshoulder 99 between these parts. Unit 92 is shown in more detail in FIG.5. In the end part 97 there is also an annular groove 101 which receivesthe snap ring 102. Numeral designates the mandrel member which comprisesa threaded mandrel 1 12 extending from cylindrical body 114 that fits inbore 96. Unit 110 has a transverse bore that receives a pin 122. SeeFIG. 5. The pin 122 has a central annular groove 124 as may be seen moreclearly in FIG. 8. The unit 110 has an axial bore as shown at 126 inwhich is a detent ball 130 that detents in the annular groove 124 asshown. The ball 130 is urged in detenting direction by coil spring 132in the bore 126, the end of the bore being slightly enlarged and closedby set screw 134. See FIG. 8. I

The unit 110 has another radial bore in which is a coil spring 142 thatbears'against a detenting ball 144 that can be engaged in semi-sphericalrecess in the inside, that is, in the wall of the bore 96 for purposesof holding the unit 110 in position as will be described hereinafter.

The member 94 has axial slots in its sidewalls, one of which may be seenat 152 to receive the end parts of the rod or pin 122. Thus, it may beseen that the unit 110 has limited axial movement within the bore 96 ofthe drive member.

Fitting onto the drive member 92 is a clutch member 160. The clutchmember has a cylindrical body part 162 having a bore 164 with a shortcounterbore 166 at the opposite end forming a square shoulder whichcomes into engagement with the square shoulder 99 on the body 94. Theclutch part has a flange 168 at one end and in this flange arediametrically opposed grooves-or recesses 170 and 172. These groovesengage .or fit onto splines 174 and 176 which are diametrically opposedwithin the housing 50. Thus, the clutch member 160 may have axialmovement but is not free to rotate. It does not have freedom of axialmovement on the member 92, being restrained by the square shoulder 99and the retaining ring 102. The drive member 92 can rotate within theclutch member 160. On the end face of the clutch member 160 are providedtwo cam shoulders one of which may be seen at 180 in FIG. 5. These camshoulders have a gradual rise 182 on one side and a square shoulder 184on the other side.

The operation of the installation gun will next be described. Aspreviously pointed out, an exemplary form of fastener is shown which isof the type wherein a mandrel .is first threaded into a nut part; thenut part being drawn inwardly relative to a sleeve for splitting,curling back and crimping the split leaves of the sleeve so that thefastener becomes set, after which the mandrel is threaded out of the setfastener.

For purpose of description the fastener is designated generally atcomprising a nut part 192 which in the exemplary form is initiallyintegral with a sleeve part 194 having an end flange 196. At the outsetthe fastener is placed in the hole where it is to be set as may be seenin FIG. 1. The threaded mandrel l 12 of the tool is threaded into thefastener and this is done automatically by pulling the trigger 20causing the parts within the tool to rotate to thread into the nut 192.At this time the gun rotates the housing 68, the drive screw 86, theunit 92, and the mandrel 112. At this time the stop nut 88 is up againstthe drive nut 80. For purposes of this description, this rotation may beclockwise. When the anvil 62 at the end of the anvil member 58 contactsthe fastener, that is, the flange 196, the forward movement of the toolis stopped; mandrel 112 is pulled out and the drive pin 122 is forced ina clockwise rotation axially forward, being guided in the slots as shownat 152. The drive pin 122 now engages the shoulders such as shown at 180on the clutch member 160 so that rotation of the mandrel member 112immediately is stopped. Ball 144 now detents into recess 150. Thisbrings the square drive thread 86 into play. Since this threaded stemcannot now rotate, rotation of the drive nut 80 causes it to moveaxially, with the stop nut 88 moving away from the drive nut as may beseen in FIG. 3. FIGS. 2, 3, and 4 illustrate the action on the fastenerof the axial movement of the mandrel 1 12. The nut part 192 shears fromthe sleeve part 194 and is drawn into it and the annular shoulder on thenut 192 splits the tapered end of the sleeve part into leaves and curlsthem back and crimps them against the material in which the fastener isbeing set. FIG. 2 illustrates the position of the parts after axial pullhas started and the nut 192 has begun to move into the sleeve 194. FIG.3 illustrates the position of the parts at the limit of axial pull onthe mandrel 112 with the fastener completely set. FIG. 4 illustrates theposition of the parts when the direction of rotation has been reversedfor unthreading the mandrel 112 from the set fastener. Upon reversal ofthe rotation drive stem 86 moves axially in the opposite direction untilstop nut 88 engages drive nut 80, at which drive stem 86 turns and unit92 turns; pin 122 engages the rises 182 on clutch member 160 todisengage the clutch allowing continuing rotation and unthreading of themandrel, pin 122 moving in the slots such as shown at 152 into theposition as in FIG. 4.

FIGS. 9 and 10 illustrate a modified form of the invention embodying aslightly different type of clutch, parts that are the same beingidentified by the same reference numerals. In this form of the inventionthe clutch member 160' instead of having shoulders like the shouldersshown as 180, has on the skirt or cylindrical part 162 continuous sawteeth 163 around the end face of the member. Additional clutch member161 is provided which is cylindrical as shown with continuous notches orteeth in the end face as shown at 165. The pin 122 goes through radialor transverse bores 123 in the member 161 as well as going throughmandrel member 110.

The operation of the form of the invention shown in FIGS. 9 and 10 isthe same as, or very closely similar to the operation of the previousform of the invention. The sequence is the same as described inconnection with FIGS. 1 to 8. However, now when the anvil seats againstthe fastener, the member 110 and the clutch member 161 both moverelatively to the right so that the clutch member 161 engages the clutchmember 160' stopping rotation as previously described and beginning theaxial pull movement which is the same as described in the foregoing.Upon completion of axial pull and reversal of rotation for unthreadingclutch member 161 by engagement of its teeth with the oppositelyangulated teeth on clutch member 100 to move itself and member 1 10 intodisengaged position.

When it is necessary to change the mandrel 112 (unit disengaged 110),the housing 50 is unthreaded exposing pin 122 which is disengaged by wayof a light tap it normally being held in position as described inconnection with FIG. 8. Another mandrel unit is then simply substituted.

FIGS. 11 and 12 show another modified form of the invention which issimilar to the form of the invention shown in FIGS. 9 and 10. Similar orcorresponding parts are identified by the same reference characters. Theimprovement in this form of the invention resides primarily in thehelical biasing spring 200 which is associated with the clutch member160 to act on it. Without this improvement, it is possible for the teeth163 on the clutch member 160 and the teeth 165 on the clutch member 161to be in the same phase relationship so that the tips of the teeth meeteach other rather than engaging in clutching relationship. In thesecircumstances, the torque load is taken on the pin 122 at points on itspaced outwardly from its center and the load may be sufficient to bendor break this pin. The spring 200 overcomes this problem. The drivescrew member or unit 92 has an end part in which there is an annularsquare shouldered groove 202 adjacent to an end flange 204. Inwardlyfrom the annular groove is a part of reduced diameter 206 adjacent to asquare shoulder 208. The parts when assembled are as shown in FIG. 11,the clutch member 160 fitting on the end of the drive screw member orunit 92 with the clutch member against the square shoulder 208. Theclutch member 160 has a flange 210 with two diametrically opposed squarenotches in it as shown at 212 and 214. The inside of the flanged part isof enlarged diameter as shown at 216 forming a square shoulder 218adjacent to the internal diameter of the body part 162. When the partsare assembled, they appear as shown in FIG. 11. The spring 200 isreceived in the annular groove 202 in the drive screw unit 92' in aposition between the square shoulder formed by the counterbore 216 inthe clutch member 160' and the flange 204 on the end of the drive screwunit 92. As can be seen therefore, spring 200 exerts an axial biasingforce biasing the clutch member 160 toward the clutch member 161 andthereby eliminates the possibility of the ends of the teeth on the twoclutch members meeting or matching each other and preventing engagement,and accordingly, the deficiency referred to in the foregoing isovercome.

FIGS. 14 and 15 show an improved and preferred form of drive nut andstop 88. The drive nut 80' as in the previous embodiment is threadedinto the end of the cylinder or drive unit 68' and has an annular endflange that comes up against the end of the unit 68 as designated at230. It drives against the thrust bearing 82 as in the previousembodiment. It threads on the drive screw 86. At its left end is atapered bore 232 which receives the stop nut 88' and the stop nut has ataper as shown complementary to the taper 232 in the drive nut 80. Atthe end of the stop nut 88', it has a short axial surface 234. It may besecured to the drive screw 86 by set screw 90 as in the previousembodiment. As may be seen, the tapered surfaces on the nuts comes intoengagement to perform the clutching action rather than flat, radialsurfaces. The operation is otherwise as in the previous embodiment.

From the foregoing, those skilled in the art will observe and understandthe nature and construction of the invention, its operation and themanner in which it achieves and realizes all of the objects andadvantages set forth in the foregoing, as well as the many additionaladvantages that are apparent from the detailed description.

The foregoing disclosure is representative of preferred forms of theinvention and is to be interpreted in an illustrative rather than alimiting sense, the invention to be accorded the full scope of theclaims appended hereto.

WHAT IS CLAIMED IS:

1. An installation tool of the type for setting fasteners of the typewherein the fastener comprises parts requiring an initial rotary actionfor threading into a part followed by a straight axial pull for finallysetting the fastener, in combination, a tool embodying a drive means anda threaded mandrel adapted to engage a part of the fastener in threadedrelationship and to be threaded into said part whereby to draw thethreaded part along the rotating mandrel, said drive means for themandrel embodying a clutch operable to be actuated to prevent rotationof the mandrel, the said tool having a part engageable with the materialbeing worked on by the tool whereby relative axial movement of themandrel causes the clutch to operate to prevent further rotation of themandrel, and said tool embodying means whereby upon operation of theclutch to discontinue rotation of the mandrel the drive means operatesto exert a straight line axial force on the mandrel serving to completethe setting of the fastener, said mandrel being mounted to have axialmovement relative to the drive means for engaging and disengaging thesaid clutch.

2. A tool as in claim 1, wherein said clutch has a part engaged with thebody of the tool so as to not rotate with the mandrel, and the saidmandrel having means engageable with the said clutch part to preventrotation of the mandrel when the mandrel is moved axially relative tothe clutch part.

3. A tool as in claim 2, wherein said clutch part has engagement with atool body allowing axial movement thereof relative to the tool bodywhereby after rotational movement of the mandrel has been terminatedaxial movement may be imparted to the mandrel relative to the tool body.

4. A tool as in claim 1, wherein said drive means comprises a rotarymember and a threaded stem connected to said mandrel associated withsaid rotary member, means whereby said rotary member is secured to saidthreaded stem for rotating the mandrel and for releasing from saidthreaded stem when rotation of the mandrel is prevented whereby therotary member rotates relative to the threaded stem and by way of thethread transmits axial pull to it.

5. An installation tool of the type for setting fasteners of the typewherein the fastener comprises parts requiring an initial rotary actionfor threading into a part followed by a straight axial pull for finallysetting the fastener, in combination, a tool embodying drive means and athreaded mandrel adapted to engage part of the fastener in threadedrelationship and to be threaded into said part whereby to draw thethreaded part along the rotating mandrel, said drive means comprisingthreaded stem means having a drive nut and a stopnut thereon, rotarydrive means engaging the stem in threaded relationship, the threadedstem means having engagement with the mandrel whereby the drive meansnormally can rotate the threaded stem and mandrel, and means wherebyafter rotation of the mandrel continued rotation of the threaded stemand mandrel is prevented whereby the drive means rotates relatively tothe threaded stem imparting axial movement to the threaded stem andmandrel, said stopnut being adjustably positionable on said threadedstem with the threaded stem in adjustable positions relative to thedrive nut whereby the length of stroke imparted to the stem in aninitial point is adjustable.

6. A tool as in claim 5, embodying a clutch device operable to terminaterotation of the threaded stem and mandrel in response to a relativelysmall 'axial movement of the mandrel.

7. A tool as in claim 6, wherein said means for terminating rotation ofthe threaded stem comprises a clutch having a part which is mounted insaid tool so as to not be rotatable, a clutch member engageable anddisen ageable with said part said clutch member being axial y movablerelative to the part by an axial movement of the threaded mandrelrelative to the tool.

8. A tool as in claim 7 including releaseable detent means for holdingsaid clutch part and said clutch member in engagement.

9. An installation tool of the type for setting fasteners of the typewherein a fastener comprises parts requiring an initial rotary actionfor threading into a part followed by a straight axial pull for finallysetting the fastener, in combination, a tool embodying drive means and athreaded rotatable mandrel adapted to engage part of the fastener inthreaded relationship and to be threaded into said part whereby to drawthe threaded part along the rotating mandrel, said drive meanscomprising threaded stem means, a rotary drive means engaging the stemin threaded relationship, means whereby the drive means can eitherrotate the threaded stem or can impart a linear axial stroke to it whichis adjustable in length, said last means comrpisng said drive meanshaving a drive nut engaging said threaded stem and means comprising anadjustable stop nut adjustably positionable on said threaded stem withthe threaded stem in adjustable positions relative to the drive nutwhereby the length of stroke imparted to the stem from an initial pointis adjustable.

10. An installation tool as in claim 5, wherein the drive means has asocket to receive the mandrel and means for holding the mandrelin'position.

11. An installation tool as in claim 9, including an anvil member at theend of the tool through which the mandrel extends, said anvil memberbeing threaded and being adjustable relative to the tool to adjust theposition at which the anvil and fastener come into engagement.

12. An installation tool as in claim 1, wherein said clutch embodiesclutch members and biasing means urging one member toward the other.

1. An installation tool of the type for setting fasteners of the typewherein the fastener comprises parts requiring an initial rotary actionfor threading into a part followed by a straight axial pull for finallysetting the fastener, in combination, a tool embodying a drive means anda threaded mandrel adapted to engage a part of the fastener in threadedrelationship and to be threaded into said part whereby to draw thethreaded part along the rotating mandrel, said drive means for themandrel embodying a clutch operable to be actuated to prevent rotationof the mandrel, the said tool having a part engageable with the materialbeing worked on by the tool whereby relative axial movement of themandrel causes the clutch to operate to prevent further rotation of themandrel, and said tool embodying means whereby upon operation of theclutch to discontinue rotation of the mandrel the drive means operatesto exert a straight line axial force on the mandrel serving to completethe setting of the fastener, said mandrel being mounted to have axialmovement relative to the drive means for engaging and disengaging thesaid clutch.
 2. A tool as in claim 1, wherein said clutch has a partengaged with the body of the tool so as to not rotate with the mandrel,and the said mandrel having means engageable with the said clutch partto prevent rotation of the mandrel when the mandrel is moved axiallyrelative to the clutch part.
 3. A tool as in claim 2, wherein saidclutch part has engagement with a tool body allowing axial movementthereof relative to the tool body whereby after rotational movement ofthe mandrel has been terminated axial movement may be imparted to themandrel relative to the tool body.
 4. A tool as in claim 1, wherein saiddrive means comprises a rotary member and a threaded stem connected tosaid mandrel associated with said rotary member, means whereby saidrotary member is secured to said threaded stem for rotating the mandreland for releasing from said threaded stem when rotation of the mandrelis prevented whereby the rotary member rotates relative to the threadedstem and by way of the thread transmits axial pull to it.
 5. Aninstallation tool of the type for setting fasteners of the type whereinthe fastener comprises parts requiring an initial rotary action forthreading into a part followed by a straight axial pull for finallysetting the fastener, in combination, a tool embodying drive means and athreaded mandrel adapted to engage part of the fastener in threadedrelationship and to be threaded into said part whereby to draw thethreaded part along the rotating mandrel, said drive means comprisingthreaded stem means having a drive nut and a stopnut thereon, rotarydrive means engaging the stem in threaded relationship, the threadedstem means having engagement with the mandrel whereby the drive meansnormally can rotate the threaded stem and mandrel, and means wherebyafter rotation of the mandrel continued rotation of the threaded stemand mandrel is prevented whereby the drive means rotates relatively tothe threaded stem imparting axial movement to the threaded stem andmandrel, said stopnut being adjustably positionable on said threadedstem with the threaded stem in adjustable positions relative to thedrive nut whereby the length of stroke imparted to the stem in aninitial point is adjustable.
 6. A tool as in claim 5, embodying a clutchdevice operable to terminate rotation of the threaded stem and mandrelin response to a relatively small axial movement of the mandrel.
 7. Atool as in claim 6, wherein said means for terminating rotation of thethreaded stem comprises a clutch having a part which is mounted in saidtool so as to not be rotatable, a clutch member engageable anddisengageable with said part, said clutch member being axially movablerelative to the part by an axial movement of the threaded mandrelrelative to the tool.
 8. A tool as in claim 7 including releaseabledetent means for holding said clutch part and said clutch member inengagement.
 9. An installation tool of the type for setting fasteners ofthe type wherein a fastener comprises parts requiring an initial rotaryaction for threading into a part followed by a straight axial pull forfinally setting the fastener, in combination, a tool embodying drivemeans and a threaded rotatable mandrel adapted to engage part of thefastener in threaded relationship and to be threaded into said partwhereby to draw the threaded part along the rotating mandrel, said drivemeans comprising threaded stem means, a rotary drive means engaging thestem in threaded relationship, means whereby the drive means can eitherrotate the threaded stem or can impart a linear axial stroke to it whichis adjustable in length, said last means comrpisng said drive meanshaving a drive nut engaging said threaded stem and means comprising anadjustable stop nut adjustably positionable on said threaded stem withthe threaded stem in adjustable positions relative to the drive nutwhereby the length of stroke imparted to the stem from an initial pointis adjustable.
 10. An installation tool as in claim 5, wherein the drivemeans has a socket to receive the mandrel and means for holding themandrel in position.
 11. An installation tool as in claim 9, includingan anvil member at the end of the tool through which the mandrelextends, said anvil member being threaded and being adjustable relativeto the tool to adjust the position at which the anvil and fastener comeinto engagement.
 12. An installation tool as in claim 1, wherein saidclutch embodies clutch members and biasing means urging one membertoward the other.